Question

Oxycodone (C18H21NO4), a narcotic analgesic, is a weak base with pKb=5.47. Part A Calculate the pH in a 0.00270 M oxycodone solution. Express your answer using three significant figures. pH = 9.97 SubmitMy AnswersGive Up Correct Part B Calculate the concentrations of C18H21NO4 in a 0.00270 M oxycodone solution. Express your answer to two significant figures and include the appropriate units. SubmitMy AnswersGive Up Part C Calculate the concentrations of HC18H21NO+4 in a 0.00270 M oxycodone solution. Express your answer to two significant figures and include the appropriate units. 1.07*10^1-10 M M SubmitMy AnswersGive Up Incorrect; Try Again; 5 attempts remaining Part D Calculate the concentrations of H3O+ in a 0.00270 M oxycodone solution. Express your answer to two significant figures and include the appropriate units. SubmitMy AnswersGive Up Part E Calculate the concentrations of OH− in a 0.00270 M oxycodone solution. Express your answer to two significant figures and include the appropriate units.

Answer 1

Oxycodone (C18H21NO4), a narcotic analgesic, is a weak base with pKb=5.47. Part A Calculate the pH in a 0.00270 M oxycodone solution

The ionizationof C18H21NO4+ H2O-------->C18H22NO4⁺ + +OH-

PKb= 5.47, Kb= 10^(-5.47)= 3.388*10^-6

Kb= [C18H22NO4+] [OH-]/ [C18H21NO4]

let x= drop in concentration of Oxydocone, At equilibrium, [C18H22NO4]= 0.0027-x, [C18H22NO4+]= [OH-]=x

Kb= x²/(0.0027-x)= 3.388*10^-6 , when solved using excel, x= 9.38*10^-5,

pOH= 4.03, pH= 14-4.03=9.97